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Maine Revised Statutes
Updated October 2022by:These statutes belong to the Accessory Dwelling Units, Environmentally Sensitive Areas, Housing Supply Planning, Planning and Zoning Enabling Laws, Scenic View Protection, Tiny Houses and Micro-Apartments, and Transfer of Development Rights collections. -
New Hampshire Statutes
Updated 2019These statutes belong to the Accessory Dwelling Units, Capital Improvements Programming, Planning and Zoning Enabling Laws, and Transfer of Development Rights collections. -
Home Remedies: Accessory Apartments on Long Island
June 2017by: Elizabeth MooreThis report analyzes local regulations for accessory dwelling units (ADUs) on New York's Long Island. -
A Racial Equity Toolkit on Policies for Accessory Dwelling Units
October 2018by: Susie LevyThis briefing paper uses Seattle's Racial Equity Toolkit model to evaluate the effects of the city's policy approach to accessory dwelling units. -
Backyard Homes and Local Concerns
2014by: Vinit Mukhija, Dana Cuff, Kimberly SerranoThis report analyzes local concerns about accessory dwelling units (ADUs) in Los Angeles and discusses how those concerns may be best addressed. -
Making Big Sense of Small Homes
8 Domains of Livability Case Studies, August 2015This case study profiles efforts in Portland, Oregon, to remove regulatory and financial barriers to accessory dwelling unit (ADU) construction. -
Ocean Springs, MS, Code of Ordinances
Updated June 2019The city's unified development code permits one internal, attached, or detached accessory dwelling unit (ADU) in association with any single-family dwelling. -
2018 Home and Community Preferences: A National Survey of Adults Ages 18-Plus
Updated July 2019by: Joanne BinetteThis report presents the results of a survey of adults, which included a series of questions about accessory dwelling units (ADUs). -
Webinar: Accessory Dwelling Units
June 2018This online training presents an overview of accessory dwelling unit (ADU) policies and practices across the U.S. -
ADUs Help Families Address a Variety of Housing Needs
2019This video highlights the individual and community benefits of accessory dwelling units (ADUs). -
Big House, Little House, Back House...ADU?
PlanningWebcast, March 2018This online training provides a primer on zoning issues related to accessory dwelling units (ADUs). -
Yes, in My Backyard: Building ADUs to Address Homelessness
Homeless Rights Advocacy Project, 12, May 2018by: Tran Dinh, David Brewster, Anna FullertonThis report explores how specific cities and nonprofit organizations have used accessory dwelling units (ADUs) as a housing strategy for individuals experiencing homelessness. -
ADUniverse: Creating a Tool to Support Homeowners Interested in Building an ADU
September 2019by: Rick Mohler, Nick WelchThis website describes an effort to build a tool to help Seattle residents evaluate opportunities to build accessory dwelling units (ADUs). -
Lexington, KY, Homeowner’s Guide to Accessory Dwelling Units
January 2019This guide is designed to help home owner's in Lexington, Kentucky, plan and build accessory dwelling units (ADUs). -
In-Law—and Out-Law—Apartments
Sightline, March 2013by: Alan DurningThis blog post summarizes common barriers to accessory dwelling units (ADUs) and holds up Vancouver, British Columbia, as an example of effective ADU regulatory reform. -
Accessory Dwelling Units in New Hampshire: A Guide for Municipalities
December 2017by: Benjamin Frost, AICPThis guide is designed to help municipalities in New Hampshire develop and implement accessory dwelling unit (ADU) regulations that comply with state law. -
Accessory Dwelling Units: A Flexible Free-Market Housing Solution
R Street Policy Study No. 89, March 2017by: Jonathan CoppageThis briefing paper provides a primer on accessory dwelling units (ADUs) and summarizes common regulatory barriers to ADU development. -
Twin Cities ADU Guidebook for Homeowners
February 2019by: Casey Lauderdale, AICPThis guide is designed to help home owner's in the Twin Cities region of Minnesota plan and build accessory dwelling units (ADUs). -
ADUs and Don'ts
Sightline, March 2013by: Alan DurningThis blog post presents the results of analysis of ADU regulations across Cascadia in the early 2010s. -
Nothing ADU-ing
Sightline, March 2013by: Alan DurningThis blog post examines the prevalence of ADU permitting across Cascadia in the early 2010s. -
Londonderry, NH, Municipal Codes
Updated August 2019The town's zoning code permits one internal, attached, or detached accessory dwelling unit (ADU) by right on any lot with an owner-occupied single-family home. -
Seattle Says Yes to the Best Rules in America for Backyard Cottages
Sightline, July 2019by: Dan Bertolet, Margaret MoralesThis blog post summarizes zoning reforms for accessory dwelling units (ADUs) in Seattle. -
Tacoma Adopts Exemplary Reform for In-Law Apartments
Sightline, March 2019by: Dan Bertolet, Nisma GabobeThis blog post profiles accessory dwelling unit (ADU) regulatory reforms in Tacoma, Washington. -
Could Your Backyard Help Ease the Affordable Housing Crisis?
Sightline, October 2018by: Margaret MoralesThis blog posts discusses how some communities are using accessory dwelling units (ADUs) to increase the supply of income-qualified affordable housing. -
ADU Parking Quotas Are Climate Killers
Sightline, February 2019by: Margaret MoralesThis blog post discusses the most common justifications for removing parking requirements for accessory dwelling units (ADUs). -
LA ADU Story: How a State Law Sent Granny Flats Off the Charts
Sightline, April 2019by: Dan Bertolet, Nisma GabobeThis blog post discusses how a legislative change in California has translated into increased accessory dwelling unit (ADU) production. -
How Backyard Cottages Could Help Close the Affordable Housing Gap
Sightline, August 2018by: Margaret MoralesThis blog post discusses the potential role accessory dwelling units (ADUs) could play in addressing a shortage of affordable housing in Cascadia. -
Impact Fees Are ADU Busters
Sightline, February 2019by: Dan BertoletThis blog post discusses how waiving impact fees can boost accessory dwelling unit (ADU) production. -
Montana Code
Updated September 2022These statutes belong to the Accessory Dwelling Units, Environmentally Sensitive Areas, and Planning and Zoning Enabling Laws collections. -
Washington Revised Code
Updated June 2022These statutes belong to the Accessory Dwelling Units, Capital Improvements Programming, Environmentally Sensitive Areas, Housing Supply Planning, and Planning and Zoning Enabling Laws collections. -
Washington, DC, Zoning Regulations
Updated December 2019This regulation belongs to the Accessory Dwelling Units, Biophilic Planning, Green Stormwater Infrastructure, and Housing Supply Planning collections. -
Overcoming Barriers to Bringing ADU Development to Scale
September 2020by: Ahmad Abu-KhalafThis report analyzes opportunities to address common regulatory and financial barriers to expanding the production and occupancy of accessory dwelling units (ADUs). -
Mandan, ND, Code of Ordinances
Updated December 2019The city's land development code permits internal, attached, and detached accessory dwelling units (ADUs) by right in two residential zoning districts. -
Land Use Reforms for Housing Supply: Case Studies on the Process for Passing and Implementing Regulation Changes
October 2020by: Lydia Lo, Eleanor Noble, Diane LevyThis report presents case studies of accessory dwelling unit regulatory reform efforts in Portland, Oregon, and Washington, D.C. -
The Great "Yes in My Back Yard" (YIMBY) Movement: Driven by the Gig Economy
Journal of Affordable Housing & Community Development Law, 29(1): 57-74, 2020by: Dwight Merriam, FAICPThis article explores increased interest in accessory dwelling units (ADUs) as one manifestation of the gig economy. -
Murray City, UT, Code of Ordinances
Updated February 2023This city’s code permits attached and detached accessory dwelling units in any zone that allows for single family residences. -
Policy and Program Models for Creating Accessory Dwelling Units in New Hampshire
May 2023by: James Vayo, AICPThis report discusses program models, tools, and techniques to help cities and towns in New Hampshire support the creation of accessory dwelling units. -
Hudson, OH, Code of Ordinances
Updated January 2023This city’s code allows for one accessory dwelling unit on a lot with a single-family dwelling. -
Lawrence, KS, City Code
Updated January 2018The city’s codified ordinances belong to the Accessory Dwelling Units, Form-Based Zoning, Group Housing, and Home Occupations collections. -
California Government Code
Updated January 2022by:These statutes belong to the Accessory Dwelling Units, Capital Improvements Programming, Environmentally Sensitive Areas, Planning and Zoning Enabling Laws, and Scenic View Protection collections. -
Boise, ID, City Code
Adopted November 2011This regulation belongs to the Accessory Dwelling Units, Food Trucks, Green Building, and Small Wireless Facilities and Wireless Facilities in the ROW collections. -
Bentonville, AR, Zoning Code
Updated March 2018This regulation belongs to the Accessory Dwelling Units, Content-Neutral Sign Regulation, Downtown Revitalization, Housing Supply Planning, and Solar Energy collections. -
Chula Vista, CA, Municipal Code
Adopted February 2019This regulation belongs to the Accessory Dwelling Units, Housing Supply Planning, and Solar Energy collections. -
Denver, CO, Zoning Code
Updated July 2021This regulation belongs to the Accessory Dwelling Units, Form-Based Zoning, Group Housing, Housing Supply Planning, Short-Term Residential Rentals, Solar Energy, Urban Agriculture, Urban Livestock, Wind Energy, and Zoning Reform and Code Writing collections. -
Hailey, ID, Municipal Code
Updated October 2022This regulation belongs to the Accessory Dwelling Units, Green Building, Housing Supply Planning, Outdoor Lighting, Solar Energy, Tiny Homes and Micro Apartments, and Urban Livestock collections. -
Knoxville, TN, Code of Ordinances
Updated August 2019by: City of KnoxvilleThese regulations belong to the Accessory Dwelling Units, Downtown Revitalization, Housing Supply Planning, Residential Infill Development, and Solar Energy collections. -
Accessory Apartments for Today’s Communities
Planning Commissioners Journal, November/December 1991by: Patrick HareThis short article highlights the potential of accessory dwelling units (ADUs) as an affordable housing strategy and briefly discusses common barriers to developing ADUs. -
Accessory Dwellings
2017This website contains numerous pages with information about accessory dwelling units (ADUs) as a concept, ADU design and construction, state and local policy for ADUs, and research about ADUs. -
Vermont Statutes
Updated 2022These statutes belong to the Accessory Dwelling Units, Capital Improvements Programming, Home Occupations, Housing Supply Planning, Planning and Zoning Enabling Laws, and Transfer of Development Rights collections. -
Rhode Island Zoning Enabling Act
General Laws §45-24-27 et seq., 2017by:Rhode Island state law authorizes cities and towns to protect scenic views, establishes a transfer of development rights program, and specifies conditions for localities to permit accessory dwelling units.